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The truss rod on my new (to me) LB70P will not turn clockwise to take the bow out of the neck.I took it a local luthier and he was able to loosen it, but when he tried to tighten the rod, the adjustment nut unthreaded itself from the truss rod.I'm bummed, because the bass is beautiful and sounds awesome.Is there anything I can do, or am I stuck?Thanks in advance.....

Do you have any pictures of how it looks now? The older ones used a hex-head bolt that required a small wrench, and were dual-action as well. I've heard of some snapping (on basses each time, surprisingly), but haven't heard of one coming off the threads.

I'm not as familiar with the later allen-wrench type that are also-dual action (and seem to have less friction than the earlier ones).

Pictures are worth much in this case, even with any broken off, or unthreaded parts. If it's a simple unthreading of something, it should be able to be screwed back on, but if the rod itself broken internally, that's going to be a fairly expensive fix in the form of lifting off the fretboard and installing a new rod, gluing the fretboard down again, and possibly leveling/refretting as needed (one would hope not). Just ungluing the fretboard will take time, heat, and possibly steam to get it to loosen and lift off. Loosening any glue joint is a pain.

I wish I saved a link, but last week or so I watched a video of someone using a thin-kerf bandsaw to cut the fretboard free, taking away only .025" of material which could easily by taken up by new frets. That took a stable and "true" fence, a secure jig, and balls of iron. I worked up a sweat just watching the video.

I wish I saved a link, but last week or so I watched a video of someone using a thin-kerf bandsaw to cut the fretboard free, taking away only .025" of material which could easily by taken up by new frets. That took a stable and "true" fence, a secure jig, and balls of iron. I worked up a sweat just watching the video.

That would be enough to cause a double-pucker on a bolt on guitar neck.A through neck bass is a whole 'nother ball game though. Kudos to whoever did that video, and I haven't even seen it.

OP, please share some pics as there are some knowledgeable folks around here (and other forums as well) that may be able to help you save this bass. Best of luck either way!

I wish I saved a link, but last week or so I watched a video of someone using a thin-kerf bandsaw to cut the fretboard free, taking away only .025" of material which could easily by taken up by new frets. That took a stable and "true" fence, a secure jig, and balls of iron. I worked up a sweat just watching the video.

By that point, I would've considered the fretboard a lost cause, cut it off, cleaned the neck up with new truss rod, removed any old glue, and then applied a new fretboard, and new frets.

....or I would have recut the nut, lowered the bridge slightly, and adjusted pickups to account for the change.

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